Continuity mistake: Throughout first season: Due to stock footage spliced in from the pilot film, McGarrett's '68 4-door Mercury sedan often peeled away from the Ionali palace and then turned into a '67 2-door coupe as it cruised down Honolulu's streets.

Deliberate mistake: Throughout series: Five-O was said to be Hawaii's state police force, and was shown headquartered in the Iolani Palace. For decades, tourists were disappointed to learn that in reality, Hawaii had no state police, and that the palace was a state museum, not a state police station.

Audio problem: Throughout series: "Hawaii Five-O's" favorite sound effect was squealing tires, and the effect was nearly always added whether McGarrett's big black Mercury actually "peeled out" or pulled away at a normal speed. More than once, the tire squeal sounded when the car was sitting on beach sand. Nice trick - if you could do it. But alas, you can't "burn rubber" on a beach.

Danno was played by Tim O'Kelley in the 5-0 pilot. But a NY test audience told CBS they didn't buy him as a serious cop because he was too much of a "smart-cracking, Jimmy-Olsen-type gee-whiz kid." Leonard Freeman took the criticism to heart, and recast the part with James MacArthur for the series.